Which option correctly lists the three classic statements of the cell theory?

• A. All living organisms are composed of one or more cells; the cell is the basic unit of structure and function in living things; all cells arise from pre-existing cells.
• B. All living things are made of tissues; tissues are the basic unit of life; all tissues arise from pre-existing tissues.
• C. All cells carry out photosynthesis; the cell is the basic unit of evolution; all cells arise from pre-existing organelles.
• D. All cells contain a nucleus; the nucleus is the basic unit of heredity; all cells arise spontaneously from nonliving matter.

Answer: (A)